Telephone earpiece



1933- E. HAUS'DORF TELEPHONE EARPIECE Filed Aug. 19, 1935 m m m F. zmwYorf Patented Oct. 25, 1938 H UNITED STATES PATENT OFFICE TELEPHONE EARPIECE Erich Hausdorf, Berlin, Germany Application August 19, 1935, Serial No. 36,9 15 In Germany April 9, 1935 8 Claims. (Cl. 179-182) The invention relates to a telephone earpiece, part I in suitable fashion. This portion 2 passes which comprises a cap adapted to be placed over into the dome 3. against the ear and surround the same, and a The domepossesses the sound outlet apertures dome-like portion which contains the electrical 4. According to the invention, the space 50 of 5 apparatus and is adapted to engage into the ear. the dome is subdivided by a plurality of ribs 5. In 5 The object of the invention is to provide for the particular form of embodiment shown there greater intelligibility and increased intensity of are thus produced four equal compartments. The sound in connection with earpieces of this deribs 5 taper off towards the bottom I of the dome scription. and, as shown in Fig. 3, may be allowed to inter- This is accomplished according to the invention sect. The central point 8 of the intersecting ribs 10 by the fact that the domelike portion is subcoincides with the central axis of the earpiece. divided by ribs which are disposed vertically to Since the ribs 5 are tapered off towards the me base thereof. These ribs in the dome-like bottom of the dome the compartments converge I portion are crossed or arranged radially, and tertoward the sound outlet and thereby effect an minat'e in a sound outlet aperture in the wall of intensification of the sound waves. the dome. The undesirable cap effect results in the space In earpieces of the kind in question the inbetween the ear, the surrounding portion I, the telligibility is also affected detrimentally by the part 2 and the dome 3. In the form of embodiso-called cap effect. According to the invention, merit illustrated in the drawing there are disthis disadvantage is overcome by the fact that the posed between the part 2 and the lower portion of surfaces, which serve to confine the space between the dome ribs 6. In addition the surfaces be the portion of the earpiece surrounding the ear tween the ribs are made to be irregular, for exand that engaging into the ear, and which hereample by being hammered or otherwise roughened tofore have been perfectly smooth, are made iror indented, as indicated at Go. The surface of regular. These surfaces are furnished with ribs the dome itself will preferably not be treated in 25 or the like. In addition they may be hammered this fashion. Onthe other hand the surfaces ador punched, jacent the dome and the inner surfaces of the cap Earpieces are frequently made of resinous or I surrounding the ear will again be irregular, other non-metallic materials which are pressed for example hammered. This treatment of the into form. Now it has been found that owing to surfaces resting against the ear also results in the 30 fluctuations in the temperature, varying humidity fact that the said surfaces do not press unduly or also by reason of concussions or vibrations the on the ear, which is frequently a source of inconthreaded connection which is employed for tenvenience at the present time in the case of lengthy sioning the diaphragm within the earpiece is conversations. It has also been found that the caused to become loose. rou hened surface against the ear assists towards 35 This loosening action also tends to diminish a facilitated application of the earpiece to the considerably the intelligibility. To avoid this ear. drawback the cross-section of the thread serving II is the part of the earpiece containing the for connection of the parts and the tensioning of magnet system acting on the diaphragm. This the diaphragm is made in the form of a rightpart ll,as shown in Figs. 1 and 2, is secured to the 40 angled triangle, the hypotenuse of which is dipart 2 by means of a thread. The part 2 possesses rected towards the diaphragm. an annulus l0. Between the end of the casing II The invention is illustrated by way of example and the annulus l0 there is tensioned the diain the accompanying drawing, in which phragm 9. The thread employed for connecting Fig. 1 is a longitudinal section through an earthe parts is illustrated on enlarged scale in Fig. 2. 45 piece according to the invention. As shown in the drawing, the cross-section of the Fig. 2 shows a portion of the earpiece accordthread constitutes a right-angled triangle, the ing to Fig. 1 on enlarged scale. This figure illushypotenuse I2 of which is directed towards the trates more particularly the thread employed for diaphragm, resulting in the advantages previousconnecting the parts. 1y referred to. 50

Fig. 3 is a front view of the earpiece according What I claim as new and desire to secure by to Fig. 1. Letters Patent is:

Referring now to the drawing, I is the cap 1. Atelephone earpiece comprisingincombinawhich is adapted to be placed against the ear. tion, a cap adapted to fit against the ear and sur- The part 2 of the earpiece is connected with the round the same, a dome-like portion adapted to 66 engage into the ear, and ribs in the said domelike portion disposed angularly to the base of the dome and dividing the said dome-like portion into single compartments, all of said compartments converging toward the sound outlets whereby the sound is intensified at these outlets.

2. A telephone earpiece comprising in conibination, a cap adapted to fit against the ear and surround the same, a dome-like portion adapted to engage into the ear, and radially disposed ribs in the said dome-like portion dividing it into single compartments, all of said compartments converging toward the sound outlets whereby the sound is intensified at these outlets.

3. A telephone earpiece comprising in combination, a cap adapted to fit against the ear and surround the same, a dome-like portion adapted to engage into the ear, and intersecting ribs in the dome-like portion dividing it into single compartments, all of said compartments converging toward the sound outlets whereby the sound is intensified at these outlets.

4. A telephone earpiece comprising in combination, a cap adapted to fit against the ear and surround the same, a dome-like portion adapted toengage into the ear and ribs in the said domelike portion dividing it into single compartments and terminating in sound outlets in the wall of the dome, all of said compartments converging toward the sound outlets whereby the sound is intensified at these outlets.

5. A telephone earpiece comprising in combination, a cap adapted to fit against the ear and surround the same, a dome-like portion adapted to engage into the ear, and ribs in the said dome-like portion dividing it into single compartments, said ribs being tapered towards the base of thedome whereby all oi. the compartments converge toward the sound outlet so that the sound is intensified at these outlets.

6. A telephone earpiece comprising in combination, a cap adapted to fit against the ear and surround the same, a dome-like portion adapted to engage into the ear, and intersecting ribs in the said dome-like portion dividing it 'into single compartments, the central point of sound outlets whereby the sound is intensified at these outlets.

8. In a telephone earpiece,- a cap adapted to fit against the ear and surround the same, a dome-like portion adapted to engage into the ear, ribs in the said dome-like portion dividing it into single compartments, and ribs in the space between the said cap and the said dome-like portion all of said compartments converging toward the sound outlets whereby the sound is intensified at these outlets.

ERICH HAUSDORF. 

